Which of the following tips is not useful in saving petrol/ diesel while driving?

PCRA that is Petroleum Conservation Research Association in India has given certain tips that can help to save petrol/natural gas/diesel while driving. The tips are as follows,

·        The speed while driving should be moderate and constant as far as possible.

·        Keep the engine off when one waits at traffic lights or in some other situations.

·        Be sure about the correct and recommended tyre pressure

·        Maintain the vehicles on regular basis.

Thus, speeding up the vehicle is not useful in saving petrol/diesel while driving.